Abstract: A modified energy approach, Strain Energy-Frequency Separation （SEFS） method, is developed for predicting low cycle fatigue life at elevated temperature, since FS method fails to take the mean stress effects into account and Ostergren method is very cumbersome and complicated in dealing with wave shape effects. SEFS method combines three independent variables, inelastic strain energy （ΔεinσT）, tension-going frequency （vt） and loop-time unbalance （vc/vt）, in a power-law relation'to predict the low cycle fatigue life at high temperature （Eq. 10）. SEFS method is evaluated and compared with FS and Ostergren methods by predicting the low cycle fatigue lives of GH33A nickel base superalloy at 700℃, 1Cr18Ni9Ti stainless steel at 600℃, Rene' 95 at 650℃ and AF2-1DA at 760℃. It is shown that SEFS method is better than FS and Ostergren methods （Table 1）.